Brazing of photocathode RF gun structures in Hydrogen atmosphere: Process qualification, effect of brazing on RF properties and vacuum compatibility

Kak, Ajay; Kulshreshtha, P; Lal, Shankar; Kaul, R.; Ganesh, P.; Pant, Kamal K.; Abhinandan, Lala

doi:10.1088/1742-6596/390/1/012053

Cited by 1 publication

(1 citation statement)

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“…Under the same condition, shrinking method results in higher vacuum than brazing method because the cylindrical waveguide within which the disks are placed is constructed as a single uniform copper pipe. In many brazing processes, since the inner filler cannot be completely controlled, it is necessary to weld the outer surface of two brazed cavities after the initial vacuum test [10,17,18]. Achievement of perfect concentricity between the cavities is another advantage of shrinking method.…”

Section: Jinst 10 P06011mentioning

confidence: 99%

Investigation of using shrinking method in construction of Institute for Research in Fundamental Sciences Electron Linear Accelerator TW-tube (IPM TW-Linac tube)

Ghasemi

Davani

2015

J. Inst.

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Due to Iran's growing need for accelerators in various applications, IPM's electron Linac project has been defined. This accelerator is a 15 MeV energy S-band traveling-wave accelerator which is being designed and constructed based on the klystron that has been built in Iran. Based on the design, operating mode is π/2 and the accelerating chamber consists of two 60cm long tubes with constant impedance and a 30cm long buncher. Amongst all construction methods, shrinking method is selected for construction of IPM's electron Linac tube because it has a simple procedure and there is no need for large vacuum or hydrogen furnaces. In this paper, different aspects of this method are investigated. According to the calculations, linear ratio of frequency alteration to radius change is 787.8 MHz/cm, and the maximum deformation at the tube wall where disks and the tube make contact is 2.7µm. Applying shrinking method for construction of 8-and 24-cavity tubes results in satisfactory frequency and quality factor. Average deviations of cavities frequency of 8-and 24-cavity tubes to the design values are 0.68 MHz and 1.8 MHz respectively before tune and 0.2 MHz and 0.4 MHz after tune. Accelerating tubes, buncher, and high power couplers of IPM's electron linac are constructed using shrinking method.

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Section: Jinst 10 P06011mentioning

confidence: 99%